VectorsInGroup Function

Returns the names or optionally the physical type of all vectors in the specified group.
Argument 2 is a string array that may contain values of 'PhysType' and/or 'RealOnly'. If
'PhysType' is present the physical type (e.g. 'voltage', 'current', 'time' etc.) of the vectors
will be returned otherwise the function will return their names. If 'RealOnly' is present,
only values of type 'Real' will be returned. Complex values, string values and aliases
values will be excluded.